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US8896941B2 - Image capturing lens, optical apparatus having same, and method for manufacturing image-capturing lens - Google Patents
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US8896941B2 - Image capturing lens, optical apparatus having same, and method for manufacturing image-capturing lens - Google Patents

Image capturing lens, optical apparatus having same, and method for manufacturing image-capturing lens Download PDF

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US8896941B2
US8896941B2 US13/119,716 US200913119716A US8896941B2 US 8896941 B2 US8896941 B2 US 8896941B2 US 200913119716 A US200913119716 A US 200913119716A US 8896941 B2 US8896941 B2 US 8896941B2
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image
lens group
lens
focusing
side lens
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US20110169974A1 (en
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Toshinori Take
Takayuki Sensui
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Nikon Corp
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Nikon Corp
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
    • G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B43/00—Testing correct operation of photographic apparatus or parts thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining

Definitions

  • the present invention relates to an image-capturing lens, an optical apparatus having this image-capturing lens, and a method for manufacturing the image-capturing lens.
  • a known method to solve this problem is combining a detection system for detecting camera blur, a computing system for controlling the shift lens group according to a value which is output by the detection system, and a drive system for shifting the shift lens group as an optical system that can shift images in the image-capturing lens, and correcting the image blur by driving the shift lens group so as to compensate for image blur due to camera blur.
  • Patent Document 1 Japanese Laid-Open Patent Publication No. H1-155310
  • an object of the present invention to provide an image-capturing lens which can correct various aberrations suitably, can minimize the performance change upon shifting the lens, is compact, and has excellent optical performance throughout the entire screen, an optical apparatus having this image-capturing lens, and a method for manufacturing this image-capturing lens.
  • an image capturing lens of the present invention has, in order from an object, an object side lens group, and an image side lens group which is disposed next to the object side lens group with an air space, wherein focusing is performed from a distant object to a close object by moving at least a part of the image side lens group along an optical axis as a focusing lens group, and image stabilization is performed by moving at least a part of the image side lens group, as a shift lens group, so as to have components substantially orthogonal to the optical axis.
  • the image side lens group has positive refractive power.
  • At least a part of the focusing lens group is the shift lens group.
  • f denotes a focal length of the image capturing lens
  • ⁇ d 2 denotes a length on the optical axis from a lens surface closest to the object to a lens surface closest to the image in the image side lens group.
  • f 1 denotes a focal length of the object side lens group
  • f 2 denotes a focal length of the image side lens group.
  • f denotes a focal length of the image capturing lens
  • fs denotes a focal length of the shift lens group.
  • r 1 R denotes a radius of curvature of an image side surface of a lens closest to the object in the object side lens group
  • r 2 F denotes a radius of curvature of an object side surface of a lens disposed at the image side of the lens closest to the object.
  • TL denotes a total length of the image capturing lens
  • ⁇ d denotes a length, on the optical axis, from a lens surface closest to the object in the object side lens group to a lens surface closest to the image in the image side lens group.
  • the object side lens group has positive refractive power.
  • the focusing lens group is the shift lens group.
  • the focal length of the image capturing lens is fixed.
  • the image side lens group has a positive lens component, and the positive lens component includes at least one aspherical surface.
  • an aperture stop is disposed between the object side lens group and the image side lens group.
  • the image side lens group has a negative lens component disposed closest to the object, and a positive lens component disposed at the image side of the negative lens component.
  • the image side lens group has a cemented lens which has a negative lens component and a positive lens component, and has a positive or negative refractive power.
  • the image side lens group has a cemented lens of a negative meniscus lens having a concave surface facing the object, and a positive meniscus lens having a convex surface facing the image.
  • An optical apparatus of the present invention (digital single lens reflex camera 1 in the case of the present embodiment) has the above mentioned lens as the image-capturing lens for forming an image on a predetermined image plane.
  • a method for manufacturing an image-capturing lens of the present invention includes: disposing, in order from an object, an object side lens group and an image side lens group which is disposed next to the object side lens group with an air space; moving at least a part of the image side lens group in the optical axis direction, as a focusing lens group, upon focusing from a distant object to a close object; and moving at least a part of the image side lens group, as a shift lens group, so as to have components substantially orthogonal to the optical axis upon stabilizing an image.
  • an image-capturing lens which can correct various aberrations well, can minimize the performance change upon shifting the lens, is compact, and has excellent optical performance throughout the entire screen, an optical apparatus having this image-capturing lens, and a method for manufacturing this image-capturing lens can be provided.
  • FIG. 1 is a diagram depicting a configuration of an image-capturing lens according to Example 1, and a state of movement of each lens upon changing from a state of focusing on infinity to a state of focusing on close distance;
  • FIG. 2A are graphs showing various aberrations according to Example 1 upon focusing on infinity
  • FIG. 2B are graphs showing lateral aberrations according to Example 1 in the lens shift state (0.2 mm);
  • FIG. 3 are graphs showing various aberrations according to Example 1 upon focusing on close distance
  • FIG. 4 is a diagram depicting a configuration of an image-capturing lens according to Example 2, and a state of movement of each lens upon changing from a state of focusing on infinity to a state of focusing on close distance;
  • FIG. 5A are graphs showing various aberrations according to Example 2 upon focusing on infinity
  • FIG. 5B are graphs showing lateral aberrations according to Example 2 in the lens shift state (0.2 mm);
  • FIG. 6 are graphs showing various aberrations according to Example 2 upon focusing on close distance
  • FIG. 7 is a diagram depicting a configuration of an image-capturing lens according to Example 3, and a state of movement of each lens upon changing from a state of focusing on infinity to a state of focusing on close distance;
  • FIG. 8A are graphs showing various aberrations according to Example 3 upon focusing on infinity
  • FIG. 8B are graphs showing lateral aberrations according to Example 3 in the lens shift state (0.2 mm);
  • FIG. 9 are graphs showing various aberrations according to Example 3 upon focusing on close distance
  • FIG. 10 is a diagram depicting a configuration of an image-capturing lens according to Example 4, and a state of movement of each lens upon changing from a state of focusing on infinity to a state of focusing on close distance;
  • FIG. 11A are graphs showing various aberrations according to Example 4 upon focusing on infinity
  • FIG. 11B are graphs showing lateral aberrations according to Example 4 in the lens shift state (0.2 mm);
  • FIG. 12 are graphs showing various aberrations according to Example 4 upon focusing on close distance
  • FIG. 13 is a diagram depicting a configuration of an image-capturing lens according to Example 5, and a state of movement of each lens upon changing from a state of focusing on infinity to a state of focusing on close distance;
  • FIG. 14A are graphs showing various aberrations according to Example 5 upon focusing on infinity
  • FIG. 14B are graphs showing lateral aberrations according to Example 5 in the lens shift state (0.15 mm);
  • FIG. 15 are graphs showing various aberrations according to Example 5 upon focusing on close distance
  • FIG. 16 is a diagram depicting a configuration of an image-capturing lens according to Example 6, and a state of movement of each lens upon changing from a state of focusing on infinity to a state of focusing on close distance;
  • FIG. 17A are graphs showing various aberrations according to Example 6 upon focusing on infinity
  • FIG. 17B are graphs showing lateral aberrations according to Example 6 in the lens shift state (0.15 mm);
  • FIG. 18 are graphs showing various aberrations according to Example 6 upon focusing on close distance
  • FIG. 19 is a diagram depicting a configuration of an image-capturing lens according to Example 7, and a state of movement of each lens upon changing from a state of focusing on infinity to a state of focusing on close distance;
  • FIG. 20A are graphs showing various aberrations according to Example 7 upon focusing on infinity
  • FIG. 20B are graphs showing lateral aberrations according to Example 7 in the lens shift state (0.15 mm);
  • FIG. 21 are graphs showing various aberrations according to Example 7 upon focusing on close distance
  • FIG. 22 is a diagram depicting a configuration of an image-capturing lens according to Example 8, and a state of movement of each lens upon changing from a state of focusing on infinity to a state of focusing on close distance;
  • FIG. 23A are graphs showing various aberrations according to Example 8 upon focusing on infinity
  • FIG. 23B are graphs showing lateral aberrations according to Example 8 in the lens shift state (0.15 mm);
  • FIG. 24 are graphs showing various aberrations according to Example 8 upon focusing on close distance
  • FIG. 25 is a diagram depicting a configuration of an image-capturing lens according to Example 9, and a state of movement of each lens upon changing from a state of focusing on infinity to a state of focusing on close distance;
  • FIG. 26A are graphs showing various aberrations according to Example 9 upon focusing on infinity
  • FIG. 26B are graphs showing lateral aberrations according to Example 9 in the lens shift state (0.15 mm);
  • FIG. 27 are graphs showing various aberrations according to Example 9 upon focusing on close distance
  • FIG. 28 is a cross-sectional view depicting a digital single lens reflex camera having the image-capturing lens according to the present embodiment.
  • FIG. 29 is a flow chart depicting a method for manufacturing the image-capturing lens according to the present embodiment.
  • an image-capturing lens has, in order from an object, an object side lens group G 1 and an image side lens group G 2 which is disposed next to the object side lens group G 1 with an air space, and focusing is performed from a distant object to a close object by moving at least a part of the image side lens group G 2 along an optical axis, and image stabilization is performed by moving at least a part of the image side lens group G 2 so as to have components roughly orthogonal to the optical axis.
  • an image-capturing lens according to the present embodiment can be compact, and provide excellent optical performance throughout the entire screen.
  • the image side lens group G 2 has a positive refractive power. Also to insure the effect of the present embodiment, it is preferable that at least a part of the focusing lens group is a shift lens group. In the case when a part of the focusing lens group is the shift lens group, it is particularly preferable that a partial lens group closest to the object in the focusing lens group is the shift lens group.
  • Conditional Expression (1) appropriately specifies the total thickness ⁇ d 2 of the image side lens group G 2 on the optical axis, so as to implement both insuring high image forming performance and lighter weight of the focusing lens group. If the conditions exceed the upper limit value of conditional Expression (1), the total thickness ⁇ d 2 of the image side lens group G 2 on the optical axis is too thick. Then the lens portion of the image side lens group G 2 and a lens barrel element to support this lens portion become too large and heavy, and the moving stroke of the focusing lens group is also restricted.
  • the refractive power of the image side lens group G 2 In order to focus a close object using the focusing lens group with a small moving stroke, the refractive power of the image side lens group G 2 must be increased, which makes it difficult to correct spherical aberration and coma aberration, and is therefore not desirable. If the conditions are below the lower limit value of conditional Expression (1), the total thickness ⁇ d 2 of the image side lens group G 2 on the optical axis becomes too small. This has the advantage of reducing the size, but a number of lenses constituting the image side lens group G 2 must be decreased, which makes it impossible to correct spherical aberration, coma aberration and curvature of field generated in the image-capturing lens, and is therefore not desirable.
  • the upper limit value of the conditional Expression (1) is 0.57. To further insure the effect of the present embodiment, it is preferable that the upper limit value of the conditional Expression (1) is 0.53.
  • the lower limit value of the conditional Expression (1) is 0.29. To further insure the effect of the present embodiment, it is preferable that the lower limit value of the conditional Expression (1) is 0.31. To further insure the effect of the present embodiment, it is preferable that the lower limit value of the conditional Expression (1) is 0.33.
  • the conditional Expression (2) specifies an appropriate range of the focal length ratio between the object side lens group G 1 and the image side lens group G 2 . If the conditions exceed the upper limit value of the conditional Expression (2), the refractive power of the object side lens group G 1 becomes relatively stronger (than the image side lens group G 2 ), which makes it difficult to correct spherical aberration and coma aberration, which are generated in the object side lens group G 1 alone. Furthermore, the refractive power of the image side lens group G 2 becomes relatively weaker, which makes it difficult to correct the curvature of field well, and is therefore not desirable.
  • the refractive power of the object side lens group G 1 becomes relatively weaker (than the image side lens group G 2 ), which makes it insufficient to correct spherical aberration, and is therefore not desirable. Furthermore, a relative increase in the refractive power of the image side lens group G 2 increases the coma aberration generated in this image side lens group G 2 too high, and makes it impossible to obtain excellent optical performance.
  • conditional Expression (2) is 0.45. To further insure the effect of the present embodiment, it is preferable that the upper limit value of conditional Expression (2) is 0.43. To still further insure the effect of the present embodiment, it is preferable that the upper limit value of conditional Expression (2) is 0.40.
  • the lower limit value of the conditional Expression (2) is 0.10. To further insure the effect of the present embodiment, it is preferable that the lower limit value of the conditional Expression (2) is 0.12. To further insure the effect of the present embodiment, it is preferable that the lower limit value of the conditional Expression (2) is 0.14.
  • Conditional Expression (3) specifies the focal length fs of the shift lens group. If conditions exceed the upper limit value of the conditional Expression (3), the refractive power of the shift lens group becomes strong, which increases the spherical aberration generated in the image side lens group G 2 alone, and is therefore not desirable. If conditions are below the lower limit value of conditional Expression (3), on the other hand, the refractive power of the shift lens group becomes weak, and the image-capturing lens is no longer afocal, which increases the change of curvature of field upon shifting the lens, and is therefore not desirable.
  • the upper limit value of the conditional Expression (3) is 1.07. To further insure the effect of the present embodiment, it is preferable that the upper limit value of the conditional Expression (3) is 1.05.
  • the lower limit value of the conditional Expression (3) is 0.83. To further insure the effect of the present embodiment, it is preferable that the lower limit value of the conditional Expression (3) is 0.86. To further insure the effect of the present embodiment, it is preferable that the lower limit value of the conditional Expression (3) is 0.90.
  • r 1 R denotes a radius of curvature of the image side surface of the lens closest to the object (lens L 1 in FIG. 1 ) in the object side lens group G 1
  • r 2 F denotes a radius of curvature of the object side surface of the lens disposed at the image side of the lens closest to the object (lens L 2 in FIG. 1 ).
  • Conditional Expression (4) is for appropriately correcting the coma aberration and curvature of field which are generated in the object side lens group G 1 alone. If the conditions exceed the upper limit value of conditional Expression (4), the coma aberration and curvature of field generated in the object side lens group G 1 alone can no longer be corrected. Distortion also increases, which is not desirable. If conditions are below the lower limit values of conditional Expression (4), on the other hand, the coma aberration generated in the object side lens group G 1 alone increases so much that performance in the shortest image-capture distance deteriorates, which is not desirable.
  • conditional Expression (4) is 22.80. To further insure the effect of the present embodiment, it is preferable that the upper limit value of conditional Expression (4) is 20.80. To still further insure the effect of the present embodiment, it is preferable that the upper limit value of conditional Expression (4) is 19.00.
  • the lower limit value of the conditional Expression (4) is 2.00. To further insure the effect of the present embodiment, it is preferable that the lower limit value of the conditional Expression (4) is 3.50. To further insure the effect of the present embodiment, it is preferable that the lower limit value of the conditional Expression (4) is 5.00.
  • TL denotes a total length of the image-capturing lens (distance, on the optical axis, from the object side face of the lens disposed closest to the object to the image plane)
  • ⁇ d denotes a length, on the optical axis, from a lens surface closest to the object (surface number 1 in FIG. 1 ) in the object side lens group G 1 to a lens surface closest to the image (surface number 15 in FIG. 1 ) in the image side lens group G 2 .
  • the conditional Expression (5) specifies the appropriate total length TL of the image-capturing lens for balancing reducing size and improving performance. If conditions exceed the upper limit value of the conditional Expression (5), it is advantageous in terms of correcting aberrations, but the total length of the image-capturing lens increases, and reducing size and improving performance cannot be balanced, which is not desirable. If conditions are below the lower limit value in the conditional Expression (5), on the other hand, it is advantageous in terms of reducing size, but spherical aberration, coma aberration and curvature of field, which are generated in the image-capturing lens, cannot be corrected well. Furthermore it is difficult to increase back focus, which is not desirable.
  • conditional Expression (5) is 2.25.
  • upper limit value of conditional Expression (5) is 2.20.
  • upper limit value of conditional Expression (5) is 2.15.
  • the lower limit value of the conditional Expression (5) is 1.55.
  • the lower limit value of the conditional Expression (5) is 1.60.
  • the lower limit value of the conditional Expression (5) is 1.65.
  • the object side lens group G 1 has positive refractive power. According to the present embodiment, not only a long back focus, with respect to the total length of the image-capturing lens, can be implemented, but coma aberration and curvature of field can also be corrected well, by disposing a lens having a weak positive refractive power in the object side lens group G 1 . According to the present embodiment, to sufficiently exhibit these effects, it is preferable that the lens disposed closest to the object (lens L 1 in FIG. 1 ) in the object side lens group G 1 is a concave meniscus lens having a convex surface facing the object.
  • the focusing lens group is the shift lens group. It is also preferable that the focal length of the image-capturing lens is fixed.
  • the image side lens group G 2 has a positive lens component, and the positive lens component includes at least one spherical surface. Because of this configuration, fluctuation of distortion and curvature of field, which is generated upon focusing, can be corrected well.
  • an aperture stop S is disposed between the objective side lens group G 1 and the image side lens group G 2 .
  • the refractive power arrangement becomes closer to symmetric, that is, the objective side lens group G 1 having positive refractive power, the aperture stop S, and the image side lens group G 2 having positive refractive power (in order from the object), and curvature of field and distortion can be corrected well.
  • the image side lens group G 2 has a negative lens component disposed closest to the object, and positive lens component disposed at the image side of the negative lens component. Furthermore, it is preferable that the image side lens group G 2 has a cemented lens of a negative lens component and a positive lens component, having a positive or negative refractive power. Because of this configuration, chromatic aberration and curvature of field can be corrected well. It is preferable that the cemented lens of the image lens group G 2 has a negative meniscus lens having a concave surface facing the object, and a positive meniscus lens having a convex surface facing the image. Because of this configuration, curvature of field can be corrected well.
  • FIG. 28 shows a cross-sectional view of a digital single lens reflex camera 1 (optical apparatus) having an image-capturing lens with the above configuration.
  • a digital single lens reflex camera 1 optical apparatus
  • lights from an object which is not illustrated, are collected by the image-capturing lens 2 , and form an image on a focal plane plate 4 via a quick return mirror 3 .
  • the lights which formed an image on the focal plane plate 4 are reflected a plurality of times in a penta prism 5 , and guided to an eye piece 6 . Thereby the user can observe the object image as an upright image via the eye piece 6 .
  • the quick return mirror 3 is retracted from the optical path, and the lights of the object, which is not illustrated, are collected by the image-capturing lens 2 , form an object image on a picture element 7 .
  • the lights from the object are captured by the picture element 7 , and are recorded in a memory, which is not illustrated, as an object image.
  • the camera 1 in FIG. 28 may removably hold the image-capturing lens 2 , or may be integrated with the image-capturing lens 2 .
  • First lens groups G 1 and G 2 are assembled in a cylindrical lens barrel (step S 1 ).
  • each lens group may be disposed sequentially in the lens barrel one at a time in order along the optical axis, or a part or all of the lenses may be integratedly held on a holding member, and then assembled in the lens barrel.
  • step S 2 After assembling each lens in the lens barrel, whether the object image is formed or not is checked in a state where each lens is assembled in the lens barrel, in other words, it is checked whether the center of each lens is aligned (step S 2 ). Then various operations of the image-capturing lens are checked (step S 3 ).
  • Examples of the various operations are: a focusing operation in which lenses, which perform focusing from a distant object to a close object (image side lens group G 2 in the present embodiment), move along the optical axis, and a hand motion blur correction operation, in which at least a part of the lenses (image side lens group G 2 in the present embodiment) move so as to have components orthogonal to the optical axis.
  • the sequence of checking various operations is arbitrary.
  • Table 1 to Table 8 shown below are tables listing the values of data according to Example 1 to Example 8.
  • f is a focal length of this image-capturing lens
  • FNO is an F number
  • 2 ⁇ is an angle of view
  • Y is an image height
  • TL is a total lens length.
  • the surface number is a sequence of the lens surface counted from the object side along the light traveling direction
  • r is a radius of curvature of each lens surface
  • d is a distance from each optical surface to the next optical surface (or image plane) on the optical axis
  • nd is a refractive index at d-line (wavelength: 587.6 nm)
  • vd is an Abbe number at d-line.
  • “*” attached at the surface number indicates that this lens surface is aspherical
  • the column of the radius of curvature r indicates a paraxial radius of curvature. [0.0000] in the radius of curvature indicates a plane or an aperture.
  • the refractive index of air “1.00000”, is omitted.
  • di (i is an integer) is a variable surface distance from the i-th surface to the next lens surface.
  • [Lens Group Data] the first surface and focal length of each group are shown.
  • [Conditional Expression] values corresponding to the above mentioned conditional Expressions (1) to (5) are shown.
  • the aspherical coefficient A 2 of degree 2 is 0, which is omitted here.
  • En means ⁇ 10 n .
  • 1.234 E ⁇ 05 1.234 ⁇ 10 ⁇ 5 .
  • S ( y ) ( y 2 /r )/ ⁇ 1+(1 ⁇ y 2 /r 2 ) 1/2 ⁇ +A 4 ⁇ y 4 +A 6 ⁇ y 6 +A 8 ⁇ y 8 +A 10 ⁇ y 10 (a)
  • mm is normally used for the unit of focal length f, radius of curvature r and surface distance d, and for other lengths.
  • another appropriate unit may be used instead, since an equivalent optical performance is obtained even if an optical system is proportionally expanded or proportionally reduced.
  • FIG. 1 is a diagram depicting a configuration of an image-capturing lens according to Example 1, and a moving state of each lens upon a focusing state changing from focusing on infinity to focusing on a close distance.
  • close distance means a ⁇ 0.025 ⁇ image-capturing distance.
  • the image-capturing lens according to Example 1 has, in order from an object, an object side lens group G 1 having positive refractive power, an image side lens group G 2 having positive refractive power, and a filter group FL constituted by a low pass filter, infrared cut filter, or the like.
  • the object side lens group G 1 Upon a focusing state Changing from focusing on infinity to focusing on close distance, that is upon focusing, the object side lens group G 1 is fixed with respect to the image plane I and the image side lens group G 2 moves with respect to the image plane I, and the distance between the object side lens group G 1 and the image side lens group G 2 (axial air space d 7 in Table 1), and the distance between the image side lens group G 2 and the filter group FL (axial air space d 15 in Table 1) changes.
  • the image plane I is formed on a picture element 7 in FIG. 28 , and the picture element is constituted by a CCD, CMOS or the like.
  • the object side lens group G 1 has, in order from the object, a negative meniscus lens L 1 having a convex surface facing the object, a biconvex positive lens L 2 , and a negative meniscus lens L 3 having a convex surface facing the object.
  • the image side lens group G 2 has, in order from the object, a negative cemented lens of a negative meniscus lens L 4 having a concave surface facing the object and a positive meniscus lens L 5 having a convex surface facing the image, and a positive meniscus lens L 6 having a convex surface facing the object and a positive meniscus lens L 7 having a convex surface facing the image.
  • a hand motion blur is corrected by moving the image side lens group G 2 so as to have components roughly orthogonal to the optical axis, in order to shift the image on the image plane I upon the occurrence of an image blur.
  • An aperture stop S is disposed between the object side lens group G 1 and the image side lens group G 2 .
  • the aperture stop S is fixed with respect to the object side lens group G 1 , upon focusing from the state of focusing on infinity to the state of focusing on close distance.
  • Table 1 shows each data of Example 1.
  • the surface numbers 1 to 17 in Table 1 correspond to the surfaces 1 to 17 in FIG. 1 .
  • the image-capturing lens according to this example satisfies all the conditional Expressions (1) to (5).
  • FIG. 2 are graphs showing various aberrations according to Example 1, where FIG. 2A are graphs showing various aberrations (spherical aberration, astigmatism, distortion and coma aberration in order from the left) upon focusing on infinity, and FIG. 2B are graphs showing lateral aberration when shifting lens (lens shift state) upon focusing on infinity (moving distance according to this example is 0.2 mm).
  • FIG. 3 are graphs showing various aberrations (spherical aberration, astigmatism, distortion and coma aberration in order from the left) upon focusing on close distance in Example 1.
  • FNO is an F number
  • A is a half angle of view with respect to each image height
  • H 0 is an object height with respect to each image height.
  • the solid line indicates the sagittal image surface
  • the dotted line indicates the meridional image surface. All the aberrational curves are with respect to d-line (wavelength: 587.6 nm). The description on the graphs showing aberrations is the same for other examples.
  • the image-capturing lens As each graph showing aberrations clarifies, the image-capturing lens, according to Example 1, has excellent image forming performance, where various aberrations are corrected well in any state of focusing on infinity, lens shift state and state of focusing on close distance.
  • FIG. 4 is a diagram depicting a configuration of an image-capturing lens according to Example 2, and a moving state of each lens upon a focusing state changing from focusing on infinity to focusing on a close distance.
  • close distance means a ⁇ 0.020 ⁇ image-capturing distance.
  • the image-capturing lens according to Example 2 has, in order from an object, an object side lens group G 1 having positive refractive power, an image side lens group G 2 having positive refractive power, and a filter group FL constituted by a low pass filter, infrared cut filter, or the like.
  • the object side lens group G 1 Upon a focusing state changing from focusing on infinity to focusing on close distance, that is upon focusing, the object side lens group G 1 is fixed with respect to the image plane I and the image side lens group G 2 moves with respect to the image plane I, and the distance between the object side lens group G 1 and the image side lens group G 2 (axial air space d 7 in Table 2), and the distance between the image side lens group G 2 and the filter group FL (axial air space d 14 in Table 2) Changes.
  • the image plane I is formed on a picture element 7 in FIG. 28 , and the picture element is constituted by a CCD, CMOS or the like.
  • the object side lens group G 1 has, in order from the object, a negative meniscus lens L 1 having a convex surface facing the object, a biconvex positive lens L 2 , and a negative meniscus lens L 3 having a convex surface facing the object.
  • the image side lens group G 2 has, in order from the object, a negative meniscus lens L 4 having a concave surface facing the object, a positive meniscus lens L 5 having a convex surface facing the image, and a biconvex positive lens L 6 having an aspherical surface facing the object.
  • a hand motion blur is corrected by moving the image side lens group G 2 so as to have components roughly orthogonal to the optical axis, in order to shift the image on the image plane I upon the occurrence of an image blur.
  • An aperture stop S is disposed between the object side lens group G 1 and the image side lens group G 2 .
  • the aperture stop S is fixed with respect to the object side lens group G 1 , upon focusing from the state of focusing on infinity to the state of focusing on close distance.
  • Table 2 shows each data of Example 2.
  • the surface numbers 1 to 16 in Table 2 correspond to the surfaces 1 to 16 in FIG. 4 .
  • the image-capturing lens according to this example satisfies all the conditional Expressions (1) to (5).
  • FIG. 5 are graphs showing various aberrations according to Example 2, where FIG. 5A are graphs showing various aberrations (spherical aberration, astigmatism, distortion and coma aberration in order from the left) upon focusing on infinity, and FIG. 5B are graphs showing lateral aberration when shifting lens (lens shift state) upon focusing on infinity (moving distance according to this example is 0.2 mm).
  • FIG. 6 are graphs showing various aberrations (spherical aberration, astigmatism, distortion and coma aberration in order from the left) upon focusing on close distance. As each graph showing aberrations clarifies, the image-capturing lens, according to Example 2, has excellent image forming performance, where various aberrations are corrected well in any state of focusing on infinity, lens shift state and state of focusing on close distance.
  • FIG. 7 is a diagram depicting a configuration of an image-capturing lens according to Example 3, and a moving state of each lens upon a focusing state changing from focusing on infinity to focusing on a close distance.
  • close distance means a ⁇ 0.025 ⁇ image-capturing distance.
  • the image-capturing lens according to Example 3 has, in order from an object, an object side lens group G 1 having positive refractive power, an image side lens group G 2 having positive refractive power, and a filter group FL constituted by a low pass filter, infrared cut filter, or the like.
  • the object side lens group G 1 Upon a focusing state changing from focusing on infinity to focusing on close distance, that is upon focusing, the object side lens group G 1 is fixed with respect to the image plane I and the image side lens group G 2 moves with respect to the image plane I, and the distance between the object side lens group G 1 and the image side lens group G 2 (axial air space d 7 in Table 3), and the distance between the image side lens group G 2 and the filter group FL (axial air space d 13 in Table 3) changes.
  • the image plane I is formed on a picture element 7 in FIG. 28 , and the picture element is constituted by a CCD, CMOS or the like.
  • the object side lens group G 1 has, in order from the object, a negative meniscus lens L 1 having a convex surface facing the object, a biconvex positive lens L 2 , and a negative meniscus lens L 3 having a convex surface facing the object.
  • the image side lens group G 2 has, in order from the object, a negative cemented lens L 45 of a negative meniscus lens LA having a concave surface facing the object and a positive meniscus lens L 5 having a convex surface facing the image, and a biconvex positive lens L 6 having an aspherical surface facing the object.
  • a hand motion blur is corrected by moving the image side lens group G 2 so as to have components roughly orthogonal to the optical axis, in order to shift the image on the image plane I upon the occurrence of an Image blur.
  • An aperture stop S is disposed between the object side lens group G 1 and the image side lens group G 2 .
  • the aperture stop S is fixed with respect to the object side lens group G 1 , upon focusing from the state of focusing on infinity to the state of focusing on close distance.
  • Table 3 shows each data of Example 3.
  • the surface numbers 1 to 15 in Table 3 correspond to the surfaces 1 to 15 in FIG. 7 .
  • the image-capturing lens according to this example satisfies all the conditional Expressions (1) to (5).
  • FIG. 8 are graphs showing various aberrations according to Example 3, where FIG. 8A are graphs showing various aberrations (spherical aberration, astigmatism, distortion and coma aberration in order from the left) upon focusing on infinity, and FIG. 8B are graphs showing lateral aberration when shifting lens (lens shift state) upon focusing on infinity (moving distance according to this example is 0.2 mm).
  • FIG. 9 are graphs showing various aberrations (spherical aberration, astigmatism, distortion and coma aberration in order from the left) upon focusing on close distance in Example 3. As each graph showing aberrations clarifies, the image-capturing lens, according to Example 3, has excellent image forming performance, where various aberrations are corrected well in any state of focusing on infinity, lens shift state and state of focusing on close distance.
  • FIG. 10 is a diagram depicting a configuration of an image-capturing lens according to Example 4, and a moving state of each lens upon a focusing state changing from focusing on infinity to focusing on a close distance.
  • close distance means a ⁇ 0.025 ⁇ image-capturing distance.
  • the image-capturing lens according to Example 4 has, in order from an object, an object side lens group G 1 having positive refractive power, an image side lens group G 2 having positive refractive power, and a filter group FL constituted by a low pass filter, infrared cut filter, or the like.
  • the object side lens group G 1 Upon a focusing state changing from focusing on infinity to focusing on close distance, that is upon focusing, the object side lens group G 1 is fixed with respect to the image plane I and the image side lens group G 2 moves with respect to the image plane I, and the distance between the object side lens group G 1 and the image side lens group G 2 (axial air space d 7 in Table 4), and the distance between the image side lens group G 2 and the filter group FL (axial air space d 13 in Table 4) changes.
  • the image plane I is formed on a picture element 7 in FIG. 28 , and the picture element is constituted by a CCD, CMOS or the like.
  • the object side lens group G 1 has, in order from the object, a negative meniscus lens L 1 having a convex surface facing the object, a positive meniscus lens L 2 having a convex surface facing the object, and a negative meniscus lens L 3 having a convex surface facing the object.
  • the image side lens group G 2 has, in order from the object, a negative meniscus lens L 4 having a concave surface facing the object, a positive meniscus lens L 5 having an aspherical surface facing the object and having a convex surface facing the image, and a biconvex positive lens L 6 having an aspherical surface facing the object.
  • a hand motion blur is corrected by moving the image side lens group G 2 so as to have components roughly orthogonal to the optical axis, in order to shift the image on the image plane I upon the occurrence of an image blur.
  • An aperture stop S is disposed between the object side lens group G 1 and the image side lens group G 2 .
  • the aperture stop S is fixed with respect to the object side lens group G 1 , upon focusing from the state of focusing on infinity to the state of focusing on close distance.
  • Table 4 shows each data of Example 4.
  • the surface numbers 1 to 15 in Table 4 correspond to the surfaces 1 to 15 in FIG. 10 .
  • the image-capturing lens according to this example satisfies all the conditional Expressions (1) to (5).
  • FIG. 11 are graphs showing various aberrations according to Example 4, where FIG. 11A are graphs showing various aberrations (spherical aberration, astigmatism, distortion and coma aberration in order from the left) upon focusing on infinity, and FIG. 11B are graphs showing lateral aberration when shifting lens (lens shift state) upon focusing on infinity (moving distance according to this example is 0.2 mm).
  • FIG. 12 are graphs showing various aberrations (spherical aberration, astigmatism, distortion and coma aberration in order from the left) upon focusing on close distance in Example 4. As each graph showing aberrations clarifies, the image-capturing lens, according to Example 4, has excellent image forming performance, where various aberrations are corrected well in any state of focusing on infinity, lens shift state and state of focusing on close distance.
  • FIG. 13 is a diagram depicting a configuration of an image-capturing lens according to Example 5, and a moving state of each lens upon a focusing state changing from focusing on infinity to focusing on a close distance.
  • close distance means a ⁇ 0.015 ⁇ image-capturing distance.
  • the image-capturing lens according to Example 5 has, in order from an object, an object side lens group G 1 having positive refractive power, an image side lens group G 2 having positive refractive power, and a filter group FL constituted by a low pass filter, infrared cut filter, or the like.
  • the object side lens group G 1 Upon a focusing state changing from focusing on infinity to focusing on close distance, that is upon focusing, the object side lens group G 1 is fixed with respect to the image plane I and the image side lens group G 2 moves with respect to the image plane I, and the distance between the object side lens group G 1 and the image side lens group G 2 (axial air space d 6 in Table 5), and the distance between the image side lens group G 2 and the filter group FL (axial air space d 12 in Table 5) changes.
  • the image plane I is formed on a picture element 7 in FIG. 28 , and the picture element is constituted by a CCD, CMOS or the like.
  • the object side lens group G 1 has, in order from the object, a negative meniscus lens L 1 having a convex surface facing the object, and a positive meniscus lens L 2 having a convex surface facing the object,
  • the image side lens group G 2 has, in order from the object, a cemented lens L 34 of a negative meniscus lens L 3 having a concave surface facing the object and a positive meniscus lens L 4 having a convex surface facing the image, and a biconvex positive lens L 5 .
  • a hand motion blur is corrected by moving the image side lens group G 2 so as to have components roughly orthogonal to the optical axis, in order to shift the image on the image plane I upon the occurrence of an image blur.
  • An aperture stop S is disposed between the object side lens group G 1 and the image side lens group G 2 .
  • the aperture stop S is fixed with respect to the object side lens group G 1 , upon focusing from the state of focusing on infinity to the state of focusing on close distance.
  • Table 5 shows each data of Example 5.
  • the surface numbers 1 to 18 in Table 5 correspond to the surfaces 1 to 18 in FIG. 13 .
  • the image-capturing lens according to this example satisfies all the conditional Expressions (1) to (5).
  • FIG. 14 are graphs showing various aberrations according to Example 5, where FIG. 14A are graphs showing various aberrations (spherical aberration, astigmatism, distortion and coma aberration in order from the left) upon focusing on infinity, and FIG. 14B are graphs showing lateral aberration when shifting lens (lens shift state) upon focusing on infinity (moving distance according to this example is 0.15 mm).
  • FIG. 15 are graphs showing various aberrations (spherical aberration, astigmatism, distortion and coma aberration in order from the left) upon focusing on close distance in Example 5. As each graph showing aberrations clarifies, the image-capturing lens, according to Example 5, has excellent image forming performance, where various aberrations are corrected well in any state of focusing on infinity, lens shift state and state of focusing on close distance.
  • FIG. 16 is a diagram depicting a configuration of an image-capturing lens according to Example 6, and a moving state of each lens upon a focusing state changing from focusing on infinity to focusing on a close distance.
  • close distance means a ⁇ 0.015 ⁇ image-capturing distance.
  • the image-capturing lens according to Example 6 has, in order from an object, an object side lens group G 1 having positive refractive power, an image side lens group. G 2 having positive refractive power, and a filter group FL constituted by a low pass filter, infrared cut filter, or the like.
  • the object side lens group G 1 Upon a focusing state changing from focusing on infinity to focusing on close distance, that is upon focusing, the object side lens group G 1 is fixed with respect to the image plane I and the image side lens group G 2 moves with respect to the image plane I, and the distance between the object side lens group G 1 and the image side lens group G 2 (axial air space d 6 in Table 6), and the distance between the image side lens group G 2 and the filter group FL (axial air space d 12 in Table 6) changes.
  • the image plane I is formed on a picture element 7 in FIG. 28 , and the picture element is constituted by a CCD, CMOS or the like.
  • the object side lens group G 1 has, in order from the object, a negative meniscus lens L 1 having a convex surface facing the object, and a positive meniscus lens L 2 having a convex surface facing the object.
  • the image side lens group G 2 has, in order from the object, a cemented lens L 34 of a negative meniscus lens L 3 having a concave surface facing the object and a positive meniscus lens L 4 having a convex surface facing the image, and a biconvex positive lens L 5 .
  • a hand motion blur is corrected by moving the image side lens group G 2 so as to have components roughly orthogonal to the optical axis, in order to shift the image on the image plane I upon the occurrence of an image blur.
  • An aperture stop S is disposed between the object side lens group G 1 and the image side lens group G 2 .
  • the aperture stop S is fixed with respect to the object side lens group G 1 , upon focusing from the state of focusing on infinity to the state of focusing on close distance.
  • Table 6 shows each data of Example 6.
  • the surface numbers 1 to 18 in Table 6 correspond to the surfaces 1 to 18 in FIG. 16 .
  • the image-capturing lens according to this example satisfies all the conditional Expressions (1) to (5).
  • FIG. 17 are graphs showing various aberrations according to Example 6, where FIG. 17A are graphs showing various aberrations (spherical aberration, astigmatism, distortion and coma aberration in order from the left) upon focusing on infinity, and FIG. 17B are graphs showing lateral aberration when shifting lens (lens shift state) upon focusing on infinity (moving distance according to this example is 0.15 mm).
  • FIG. 18 are graphs showing various aberrations (spherical aberration, astigmatism, distortion and coma aberration in order from the left) upon focusing on close distance in Example 6. As each graph showing aberrations clarifies, the image-capturing lens, according to Example 6, has excellent image forming performance, where various aberrations are corrected well in any state of focusing on infinity, lens shift state and state of focusing on close distance.
  • FIG. 19 is a diagram depicting a configuration of an image-capturing lens according to Example 7, and a moving state of each lens upon a focusing state changing from focusing on infinity to focusing on a close distance.
  • close distance means a ⁇ 0.010 ⁇ image-capturing distance.
  • the image-capturing lens according to Example 7 has, in order from an object, an object side lens group G 1 having positive refractive power, an image side lens group G 2 having positive refractive power, and a filter group FL constituted by a low pass filter, infrared cut filter, or the like.
  • the object side lens group G 1 Upon a focusing state changing from focusing on infinity to focusing on close distance, that is upon focusing, the object side lens group G 1 is fixed with respect to the image plane I and the image side lens group G 2 moves with respect to the image plane I, and the distance between the object side lens group G 1 and the image side lens group G 2 (axial air space d 6 in Table 7), and the distance between the image side lens group G 2 and the filter group FL (axial air space d 12 in Table 7) changes.
  • the image plane I is formed on a picture element 7 in FIG. 28 , and the picture element is constituted by a CCD, CMOS or the like.
  • the object side lens group G 1 has, in order from the object, a negative meniscus lens L 1 having a convex surface facing the object, and a positive meniscus lens L 2 having a convex surface facing the object.
  • the image side lens group G 2 has, in order from the object, a cemented lens L 34 of a negative meniscus lens L 3 having a concave surface facing the object and a positive meniscus lens L 5 having a convex surface facing the image, and a biconvex positive lens L 5 .
  • a hand motion blur is corrected by moving the image side lens group G 2 so as to have components roughly orthogonal to the optical axis, in order to shift the image on the image plane I upon the occurrence of an image blur.
  • An aperture stop S is disposed between the object side lens group G 1 and the image side lens group G 2 .
  • the aperture stop S is fixed with respect to the object side lens group G 1 , upon focusing from the state of focusing on infinity to the state of focusing on close distance.
  • flare stop FS 1 and flare stop FS 2 are disposed before and after the aperture stop S.
  • Table 7 shows each data of Example 7.
  • the surface numbers 1 to 18 in Table 7 correspond to the surfaces 1 to 18 in FIG. 19 .
  • the image-capturing lens according to this example satisfies all the conditional Expressions (1) to (5).
  • FIG. 20 are graphs showing various aberrations according to Example 7, where FIG. 20A are graphs showing various aberrations (spherical aberration, astigmatism, distortion and coma aberration in order from the left) upon focusing on infinity, and FIG. 20B are graphs showing lateral aberration when shifting lens (lens shift state) upon focusing on infinity (moving distance according to this example is 0.15 mm).
  • FIG. 21 are graphs showing various aberrations (spherical aberration, astigmatism, distortion and coma aberration in order from the left) upon focusing on close distance in Example 7. As each graph showing aberrations clarifies, the image-capturing lens, according to Example 7, has excellent image forming performance, where various aberrations are corrected well in any state of focusing on infinity, lens shift state and state of focusing on close distance.
  • FIG. 22 is a diagram depicting a configuration of an image-capturing lens according to Example 8, and a moving state of each lens upon a focusing state changing from focusing on infinity to focusing on a close distance.
  • close distance means a ⁇ 0.015 ⁇ image-capturing distance.
  • the image-capturing lens according to Example 8 has, in order from an object, an object side lens group G 1 having positive refractive power, an image side lens group G 2 having positive refractive power, and a filter group FL constituted by a low pass filter, infrared cut filter, or the like.
  • the object side lens group G 1 Upon a focusing state changing from focusing on infinity to focusing on close distance, that is upon focusing, the object side lens group G 1 is fixed with respect to the image plane I and the image side lens group G 2 moves with respect to the image plane I, and the distance between the object side lens group G 1 and the image side lens group G 2 (axial air space d 6 in Table 8), and the distance between the image side lens group G 2 and the filter group FL (axial air space d 12 in Table 8) changes.
  • the image plane I is formed on a picture element 7 in FIG. 28 , and the picture element is constituted by a CCD, CMOS or the like.
  • the object side lens group G 1 has, in order from the object, a negative meniscus lens L 1 having a convex surface facing the object and a positive meniscus lens L 2 having a convex surface facing the object.
  • the image side lens group G 2 has, in order from the object, a cemented lens L 34 of a negative meniscus lens L 3 having a concave surface facing the object and a positive meniscus lens L 4 having a convex surface facing the image, and a biconvex positive lens L 5 .
  • a hand motion blur is corrected by moving the image side lens group G 2 so as to have components roughly orthogonal to the optical axis, in order to shift the image on the image plane I upon the occurrence of an image blur.
  • An aperture stop S is disposed between the object side lens group G 1 and the image side lens group G 2 .
  • the aperture stop S is fixed with respect to the object side lens group G 1 , upon focusing from the state of focusing on infinity to the state of focusing on close distance.
  • flare stop FS 1 and flare stop FS 2 are disposed before and after the aperture stop S.
  • Table 8 shows each data of Example 8.
  • the surface numbers 1 to 18 in Table 8 correspond to the surfaces 1 to 18 in FIG. 22 .
  • the image-capturing lens according to this example satisfies all the conditional Expressions (1) to (5).
  • FIG. 23 are graphs showing various aberrations according to Example 8, where FIG. 23A are graphs showing various aberrations (spherical aberration, astigmatism, distortion and coma aberration in order from the left) upon focusing on infinity, and FIG. 23B are graphs showing lateral aberration when shifting lens (lens shift state) upon focusing on infinity (moving distance according to this example is 0.15 mm).
  • FIG. 24 are graphs showing various aberrations (spherical aberration, astigmatism, distortion and coma aberration in order from the left) upon focusing on close distance in Example 8. As each graph showing aberrations clarifies, the image-capturing lens, according to Example 8, has excellent image forming performance, where various aberrations are corrected well in any state of focusing on infinity, lens shift state and state of focusing on close distance.
  • FIG. 25 is a diagram depicting a configuration of an image-capturing lens according to Example 9, and a moving state of each lens upon a focusing state changing from focusing on infinity to focusing on a close distance.
  • close distance means a ⁇ 0.025 ⁇ image-capturing distance.
  • the image-capturing lens according to Example 9 has, in order from an object, an object side lens group G 1 having positive refractive power, an image side lens group G 2 having positive refractive power, and a filter group FL constituted by a low pass filter, infrared cut filter, or the like.
  • the object side lens group G 1 Upon a focusing state changing from focusing on infinity to focusing on close distance, that is upon focusing, the object side lens group G 1 is fixed with respect to the image plane I and the image side lens group G 2 moves with respect to the image plane I, and the distance between the object side lens group G 1 and the image side lens group G 2 (axial air space d 7 in Table 9), and the distance between the image side lens group G 2 and the filter group FL (axial air space d 13 in Table 9) changes.
  • the image plane I is formed on a picture element 7 in FIG. 28 , and the picture element is constituted by a CCD, CMOS or the like.
  • the object side lens group G 1 has, in order from the object, a negative meniscus lens L 1 having a convex surface facing the object, a biconvex positive lens L 2 , and a negative meniscus lens L 3 having a convex surface facing the object.
  • the image side lens group G 2 has, in order from the object, a negative cemented lens L 45 of a negative meniscus lens L 4 having a concave surface facing the object, a positive meniscus lens L 5 having a convex surface facing the image, and a biconvex positive lens L 6 having an aspherical surface facing the object.
  • a hand motion blur is corrected by moving the cemented lens L 45 , which is a part of the image side lens group G 2 , so as to have components roughly orthogonal to the optical axis, in order to shift the image on the image plane I upon the occurrence of an image blur.
  • An aperture stop S is disposed between the object side lens group G 1 and the image side lens group G 2 .
  • the aperture stop S is fixed with respect to the object side lens group G 1 , upon focusing from the state of focusing on infinity to the state of focusing on close distance.
  • Table 9 shows each data of Example 9.
  • the surface numbers 1 to 15 in Table 9 correspond to the surfaces 1 to 15 in FIG. 25 .
  • the image-capturing lens according to this example satisfies all the conditional Expressions (1) to (5).
  • FIG. 26 are graphs showing various aberrations according to Example 9, where FIG. 26A are graphs showing various aberrations (spherical aberration, astigmatism, distortion and coma aberration in order from the left) upon focusing on infinity, and FIG. 26B are graphs showing lateral aberration when shifting lens (lens shift state) upon focusing on infinity (moving distance according to this example is 0.15 mm).
  • FIG. 27 are graphs showing various aberrations (spherical aberration, astigmatism, distortion and coma aberration in order from the left) in Example 9 upon focusing on close distance. As each graph showing aberrations clarifies, the image-capturing lens, according to Example 9, has excellent image forming performance, where various aberrations are corrected well in any state of focusing on infinity, lens shift state and state of focusing on close distance.
  • the following content can be adopted within a range where the optical performance is not diminished.
  • the image-capturing lens comprised of five to seven lenses was shown, but it can also be applied to a configuration where a lens is added to the side closest to the object, or a configuration where a lens is added to the side closest to the image.
  • a single or a plurality of lens group(s) or a partial lens group may be designed to be a focusing lens group, which performs focusing from an object at infinity to an object at close distance by moving in the optical axis direction.
  • This focusing lens group can be applied to auto focus, and is also suitable for driving a motor for auto focusing (e.g. driving using an ultrasonic motor). It is particularly preferable that the image side lens group is designed to be the focusing lens group.
  • a lens group or a partial lens group may be designed to perform lens group image stabilization, which corrects image blurs generated by hand motion, by moving the lens group or a partial lens group so as to have components orthogonal to the optical axis direction, or rotating (vibrating) the lens group or partial lens group in the in-plane direction, including the optical axis. It is particularly preferable that at least a part of the image side lens group is designed to perform lens group image stabilization.
  • the lens surface may be formed to be a spherical surface or plane, or an aspherical surface. If the lens surface is a spherical surface or plane, then lens processing, assembly and adjustment are easy, and deterioration of optical performance, due to an error in processing, assembly and adjustment can be prevented. Even if the image plane is shifted, the drawing performance is not affected very much, which is desirable.
  • the aspherical surface can be any one of an aspherical surface generated by grinding, a glass molded aspherical surface generated by forming glass in an aspherical shape using a die, and a composite aspherical surface generated by forming resin on the surface of the glass to be an aspherical shape.
  • the lens surface may be a diffraction surface, and the lens may be a refractive index distributed lens (GRIN lens) or plastic lens.
  • the aperture stop S is disposed between the objective side lens group G 1 and the image side lens group G 2 , but the role of the aperture stop may be substituted by the lens frame, without disposing a separate element as the aperture stop.
  • the flare cut stops FS 1 and FS 2 are disposed near the aperture stop S, but the role of the flare cut stop may be substituted by the lens frame, without disposing a separate element as the flare cut stop.
  • Each lens surface may be coated with an anti-reflection film which has high transmittance in a wide wavelength region, in order to decrease flares and ghosts, and implement a high optical performance with high contrast.
  • the Object side lens group G 1 has one positive lens component and one negative lens component. It is preferable that the lens components are disposed in the sequence of negative, positive and negative, or negative, positive and positive, with an air space respectively, in order from the object.
  • the image side lens group G 2 has two positive lens components and one negative lens component. It is preferable that the lens components are disposed in the sequence of negative, positive and positive, or negative, positive and positive, with an air space respectively, in order from the object. In the image side lens group G 2 , it is preferable that a cemented lens is disposed to an image side of the aperture stop S.
  • a positive or a negative lens L 0 may be added to an object side of a lens closest to the object in the object side lens group G 1 .
  • the total length TL of the image-capturing lens is a distance from the object side lens surface of the lens L 0 disposed closest to the object.

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